[sheepdog-users] functional test 013 is failure in current master branch

[Ruoyu]

There is no problem when test 013 is executed in stable branch.
That is to say, the error is only occurred in current master branch.
Is it related to VDI locking?

013 Last Used:4s.  Test snapshot functionality - output mismatch (see 
013.out.bad)
--- 013.out    2014-05-08 09:55:23.485439497 +0800
+++ 013.out.bad    2014-08-14 16:05:33.529083944 +0800
@@ -20,21 +20,30 @@
  512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
  read 512/512 bytes at offset 0
  512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+cannot get vdi info, VDI is already locked, test 0 tag1
+qemu-io: can't open device sheepdog:test:tag1
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag2
+qemu-io: can't open device sheepdog:test:tag2
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag3
+qemu-io: can't open device sheepdog:test:tag3
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag4
+qemu-io: can't open device sheepdog:test:tag4
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag5
+qemu-io: can't open device sheepdog:test:tag5
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag6
+qemu-io: can't open device sheepdog:test:tag6
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag7
+qemu-io: can't open device sheepdog:test:tag7
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag8
+qemu-io: can't open device sheepdog:test:tag8
+no file open, try 'help open'
+cannot get vdi info, VDI is already locked, test 0 tag9
+qemu-io: can't open device sheepdog:test:tag9
+no file open, try 'help open'
Failures: 013
Failed 1 of 1 tests